Chris Metzen and Alex Afrasiabi discussed with players at BlizzCon their desire for the World of Warcraft to be more immersive, for the characters to be more believable and relevant, and for the story to be more at the forefront, right alongside gameplay.
So now a professional screenwriter named Cocles submitted a suggestion on the forums as to how that feeling could be created, by letting the world's characters react to you in a more believable way. Here's one of his examples:
Think of how immersive it would be if you were to step into Outland and have Nazgrel look at you and say, "When I sent word to Orgrimmar that we needed more troops, I never dreamed they would send the slayer of C'thun himself to aid us. You will be a great asset to us Cocles, and I am glad to see you here!"Check out Blizzard's response beyond the jump...
Had I not killed C'thun, or done anything else of note, Nazgrel could instead look me up and down and say, "Well grunt, let's see what you're made of."